Opener's Re-bids

Re-bids after opening 1 of a suit

Re-bid a 6-card or longer suit as cheaply as possible
with less than 18 points. With more than 17 points jump re-bid.

Bid a second suit containing at least 4 cards

A reverse bid (bidding a second suit of a higher rank
than the first) promises
more than 16 points

A jump bid in a second suit of a lower rank than the
first promises more than 18 points

The response of 1NT or 2NT to an opening of 1 ♣ or 1 ♦
denies a
4-card major. Opener's re-bid of a major promises a 5-card suit.
Similarly, after an opening of 1 ♥
and a 1NT response, a rebid of 2 ♠
shows a 5-card suit

Re-bids after opening 2 ♣

Bid
a suit of more than 4 cards or bid no-trumps as cheaply as possible

If the opener rebids 2NT, the conventions which apply to
an opening 2NT apply here (3 ♣ Stayman, Jacoby transfers, and
Texas
Minor
if opted for)

If the opener rebids 2 ♥
or 2 ♠, responder then bids as
he would in reply to a strong 2 ♥
or 2 ♠ opening